Tobias acid

Tobias acid
Names
	Preferred IUPAC name 2-Aminonaphthalene-1-sulfonic acid
	Other names 2-Naphthylamine-1-sulfonic acid
Identifiers
CAS Number	81-16-3;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL3182507;
ChemSpider	6418;
ECHA InfoCard	100.001.211
EC Number	201-331-5;
PubChem CID	6670;
UNII	F9QKW1FCE0;
CompTox Dashboard (EPA)	DTXSID7020922 ;
	InChI InChI=1S/C10H9NO3S/c11-9-6-5-7-3-1-2-4-8(7)10(9)15(12,13)14/h1-6H,11H2,(H,12,13,14) Key: GWIAAIUASRVOIA-UHFFFAOYSA-N;
	SMILES C1=CC=C2C(=C1)C=CC(=C2S(=O)(=O)O)N;
Properties
Chemical formula	C10H9NO3S
Molar mass	223.25 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tobias acid (2-amino-1-naphthalenesulfonic acid) is an organic compound with the formula C₁₀H₆(SO₃H)(NH₂). It is named after the German chemist Georg Tobias.^[1] It is one of several aminonaphthalenesulfonic acids, which are derivatives of naphthalene containing both amine and sulfonic acid functional groups. It is a white solid, although commercial samples can appear otherwise.^[2] It is used in the synthesis of azo dyes such as C.I. Acid Yellow 19 and C.I. Pigment Red 49. It is prepared via the Bucherer reaction of 2-hydroxynaphthalene-1-sulfonic acid with ammonia and ammonium sulfite.^[3]

References

^ Tobias, Georg (January 1890). "Zur Anwendung der Sandmeyer' schen Reaction auf Diazosulfosäuren und über die Zersetzung dieser Verbindungen bei Gegenwart von Kupfer oder Kupferoxydul" [On the application of Sandmeyer's reaction to diazosulfonic acids and the decomposition of these compounds in the presence of copper or copper oxide]. Berichte der Deutschen Chemischen Gesellschaft (in German). 23 (1): 1628–1634. doi:10.1002/cber.189002301270.
^ CID 6670 from PubChem
^ Gerald Booth "Naphthalene Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a17_009.

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